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Transverse Josephson vortices and localized states in stacked Bose-Einstein condensates

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The stacks of Bose-Einstein condensates coupled by long Josephson junctions present a richphenomenology feasible to experimental realization and specially suitable for technologicalapplications as the nonlinear-optics and superconducting analogs have already proved. Among this,we show that transverse Bloch waves excited in arrays of one-dimensional coupled condensates cancarry tunneling superflows whose dynamical stability depends on the quasimomentum. Across thestacks with periodic boundary conditions, forming closed ring-shaped systems, such Bloch states yieldtransverse Josephson vortices with a generic non-integer circulation in units ofh/m. Additionally, thesuperpositions of degenerate linear Bloch waves can suppress the supercurrents and give rise tofamilies of nonlinear standing-wave states with strong(transverse)spatial localization. Stable states ofthis type can also be found infinite size systems.

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(c) IOP Publishing Ltd and Deutsche Physikalische Gesellschaft, 2019

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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Transverse Josephson vortices and localized states in stacked Bose-Einstein condensates